Ionic liquid for extracting phenolic compounds from oil and screening method thereof

Abstract

The invention provides an ionic liquid for extracting phenolic compounds from oil and a screening method thereof. The screening method includes the following steps: taking the oil-phenol mixture as the system to be separated, calculating the liquid-liquid phase equilibrium relationship between the ionic liquid to be screened and the oil-phenol mixture to obtain the extraction rate, partition coefficient, selectivity, neutrality, and At least two screening indicators in the entrained amount of sexual oil and the amount of ionic liquid loss; based on the at least two screening indicators, using the contrasting extractant as a reference object, the ionic liquid extractant is initially screened from a thermodynamic point of view; the thermodynamic separation effect is better than Compared with the ionic liquid of the extractant, the melting point, viscosity and thermal decomposition temperature were estimated by GCMs method, and the ionic liquid was further screened according to them. The invention relates to the technical field of ionic liquid screening. The screened ionic liquid does not contain halogen atoms, does not cause corrosion to equipment, is liquid at room temperature and has low viscosity, is conducive to mass transfer, and has good thermal stability.

Description

technical field [0001] The invention relates to the technical fields of ionic liquid screening and coal chemical industry, in particular to a screening method for an ionic liquid for extracting phenolic compounds from oil and an ionic liquid obtained by the screening method. Background technique [0002] my country is a country that uses coal as the main energy source. Coal chemical industry is the process of using coal as the basic raw material and converting coal into gas, liquid, and solid fuels through specific processes. Common processes include dry distillation, gasification, and liquefaction of coal. Among them, dry distillation is an important process to improve the utilization value of coal, and low-temperature coal tar is a dark brown liquid with high viscosity obtained by pyrolysis of coal at a dry distillation temperature of 450-600 ° C. It has a density close to that of water and has a pungent smell. strong. The processing volume and depth of most low-temperatu...

AI Technical Summary

Problems solved by technology

[0005] However, in the existing ionic liquids disclosed in the separation of phenolic compounds from coal tar, there are common shortcomings: (1) most of the ionic liquids contain halogen ions, which are relatively serious corrosion to equipment; (2) ) are solid or viscous liquids at room temperature, which is not conducive to industrial mass transfer; (3) poor thermal stability, easy to decompose when heated; (4) large amount of neutral oil entrainment in the extraction process, resulting in the separation of phenol The oil is not pure enough, and the oil loss is too large, resulting in waste of resources

However, for the extraction and separation of phenolic compounds in low-temperature coal tar, there will be neutral oil entrainment during the extraction process, resulting in a large loss of oil products, such as [C 2 The extraction rate of mim][OAc] ionic liquids for phenolic compounds can reach 99%, but the entrainment of neutral oil is also as high as 30%.

Images